First line in the input file.
abcdefghijklmnopqrstuvwxyz@abcdefghijklmnopqrstuvwxyz appears at the far left of a line.
The next e-mail appears at the far right of a line ABCDEFGHIJKLMNOPQRSTUVWXYZ@ABCDEFGHIJKLMNOPQRSTUVXWXYZ
The e-mail 0123456789@0123456789 appears in the middle
.__.__.__@--.--.--, .five@five., and six@six.com.
This line contains several possible e-mail addresses seven.seven@eight@nine.nine
And a line with some invalid addresses such as invalid.@invalid invalid@.invald (@)
1@22@333@4444@55555@666666@7777777@88888888@999999999@0000000000
Last line in the input file